JP2011201253A - Mold holding method, annular member manufacturing method and annular member manufacturing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the generation of abrasion powder generated by the friction of a core body 12 and holding members 46.SOLUTION: A pair of holding members 46 which rotate in the same direction at the same rotation speed as that of a core body 12 hold the core body 12. Thereby, the generation of abrasion powder generated by the friction of core body 12 and the holding members 46 is suppressed compared to the case of holding the core body 12 by non-rotating holding members 46.

Description

  The present invention relates to a mold holding method, a cylindrical member manufacturing method, and a cylindrical member manufacturing apparatus.

  In Patent Document 1, a liquid heat resistant resin composition is applied to the outer peripheral surface of a cylindrical core body, and the liquid heat resistant resin applied to the outer peripheral surface of the cylindrical core body is heated. A method for producing a seamless tubular article, comprising: a curing step for forming a resin coating; and a separation step for separating the resin coating from the cylindrical core. The ratio (θ1 / θ2) between the water contact angle (θ1) and the surface water contact angle (θ2) in the entire circumference of the central portion of the cylindrical core is in the range of 0.5 to 0.9. A method of manufacturing a seamless tubular product is disclosed.

  In Patent Document 2, a rotating means that rotates the core body 10 with the central axis of the core body 10 horizontal, and the film-forming resin solution 14 is discharged and attached to the core body 10, and the attached portion is relatively A dispenser 16 that is a coating means that moves in the horizontal direction from one end of the core body 10 to the other end. A manufacturing method of a tubular product and a tubular product obtained by the manufacturing method are disclosed.

JP 2005-88272 A JP 2006-7198 A

  This invention makes it a subject to suppress generation | occurrence | production of the abrasion powder produced by rubbing a metal mold | die and the holding member which hold | grips the metal mold | die.

  According to the first aspect of the present invention, the difference between the mold rotation process in which the mold is rotated by the first rotation means and the rotation speed of the mold rotated by the mold rotation process by the second rotation means is different from that of the mold. By a gripping member rotation step for rotating the gripping member in the same direction as the mold so as to be smaller than the difference from the case where the number of rotations is 0, and the gripping member rotated by the gripping member rotation step, And a gripping process for gripping a mold that is rotated by the mold rotation process.

  According to a second aspect of the present invention, in the mold rotating step, the first rotating means and the mold are disconnected to rotate the mold with inertia, and the gripping member rotating step is performed by the mold rotating step. 2. A mold holding method according to claim 1, comprising: a detection step of detecting a rotation number of a mold rotating by inertia, and a control step of controlling the rotation number of the holding member according to a detection result in the detection step. is there.

  In the invention of claim 3, the mold is formed in a columnar shape or a cylindrical shape, and the mold held by the mold holding method according to claim 1 or 2 is rotated by the second rotating means. An application step of applying a liquid to the outer peripheral surface of the mold; a heating step of heating and curing the liquid applied in the application step; and a demolding of removing the liquid cured in the heating step from the mold. And a mold process.

  According to a fourth aspect of the present invention, in the gripping step, the cylindrical member manufacturing method according to the third aspect of the present invention, wherein the gripping member grips the inner periphery of the end of the mold having a cylindrical shape and at least an axial end. It is.

  In the invention of claim 5, the difference between the first rotating means for rotating the columnar or cylindrical mold and the rotational speed of the mold rotated by the first rotating means is that the rotational speed of the mold is zero. Applying liquid to the gripping member that grips the mold and the outer peripheral surface of the mold that is rotated by the gripping member while rotating in the same direction as the mold so as to be smaller than the difference between the case and the case A cylindrical member comprising: application means for performing heating; heating means for heating and curing the liquid applied by the application means; and demolding means for releasing the liquid cured by the heating means from the mold. It is a manufacturing device.

  According to the structure of Claim 1 of this invention, compared with the case where a metal mold | die is hold | gripped with a non-rotating holding member, generation | occurrence | production of the abrasion powder which arises when a metal mold | die and a holding member rub can be suppressed.

  According to the structure of Claim 2 of this invention, compared with the case where rotation control of the holding member based on a detection result is not performed, generation | occurrence | production of the abrasion powder which arises when a metal mold | die and a holding member rub can be suppressed efficiently.

  According to the structure of Claim 3 of this invention, compared with the case where it does not hold | grip with the metal mold | die holding | grip method of Claim 1 or Claim 2, adhesion of the abrasion powder to the cylindrical member manufactured can be suppressed.

  According to the structure of Claim 4 of this invention, compared with the case where the edge part inner periphery of a metal mold | die is not gripped, adhesion of the abrasion powder to the cylindrical member manufactured can be suppressed.

  According to the structure of Claim 5 of this invention, compared with the case where a metal mold | die is hold | gripped with a non-rotating holding member, adhesion of the abrasion powder to the cylindrical member manufactured can be suppressed.

FIG. 1 is a schematic view showing the configuration of the cylindrical member manufacturing apparatus according to the present embodiment. FIG. 2 is a schematic diagram illustrating the configuration of the support device according to the present embodiment. FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 is a perspective view illustrating a configuration of the cleaning unit according to the present embodiment. FIG. 5 is a schematic diagram illustrating a state in which the core body according to the present embodiment is gripped by the gripping member. FIG. 6 is a perspective view illustrating the configuration of the application unit according to the present embodiment. FIG. 7 is a side view showing the configuration of the application unit according to the present embodiment. FIG. 8 is a schematic diagram illustrating the configuration of the drying unit according to the present embodiment. FIG. 9 is a perspective view illustrating a configuration of a firing unit according to the present embodiment.

Below, an example of an embodiment concerning the present invention is described based on a drawing.
(Configuration of the cylindrical member manufacturing apparatus 10 according to the present embodiment)
First, the configuration of a cylindrical member manufacturing apparatus 10 (hereinafter referred to as “cylindrical member manufacturing apparatus 10”) according to the present embodiment will be described. FIG. 1 is a schematic diagram illustrating a configuration of a cylindrical member manufacturing apparatus 10 according to the present embodiment.

  The cylindrical member manufacturing apparatus 10 according to the present embodiment is an apparatus for manufacturing a cylindrical member. The cylindrical member manufactured by the cylindrical member manufacturing apparatus 10 is an endless tubular body, and is a photosensitive member, an intermediate transfer belt, an intermediate transfer member, a fixing belt, a conveyance belt, a charging roll in an electrophotographic copying machine, a laser printer, or the like. It is suitably used for a transfer roll, a developing roll, and the like, and the material, shape, size and the like are appropriately set according to the application function and the like.

  As shown in FIG. 1, the cylindrical member manufacturing apparatus 10 includes a cleaning unit 30 that cleans the core body 12 as an example of a mold, and an application unit 50 as an example of an application unit that applies a resin solution 54 to the core body 12. And a heating unit 70 as an example of a heating unit that heats and cures the resin solution 54 applied by the application unit 50. The heating unit 70 includes a drying unit 72 that dries the liquid coating film 14 formed by applying the resin solution 54 from the coating unit 50, a baking unit 80 that burns the coating film 14 dried by the drying unit 72, It has.

  Furthermore, the cylindrical member manufacturing apparatus 10 includes a support device 20 that rotatably supports the core body 12, a transport unit 16 that transports the support device 20 in the cleaning unit 30, the coating unit 50, the drying unit 72, and the firing unit 80, It has.

(Configuration of core body 12)
The core body 12 is formed by a cylindrical tube. The core body 12 may be formed in a columnar shape. Further, as will be described later, in the configuration in which the pair of gripping members 46 grip the core body 12 at the inner periphery of the end portion of the core body 12, the core body 12 only needs to be circular pipes at both ends in the axial direction. The inner space may not be formed in the central portion in the axial direction.

  Further, as the core body 12, a metal such as aluminum, nickel alloy, stainless steel, or the like is used. Note that the outer peripheral surface of the core body 12 is coated by the influence of multiple products such as solvent and water remaining in the coating film 14 when the coating film 14 formed on the outer peripheral surface of the core body 12 is heated. From the viewpoint of suppressing the swelling of the film 14, it is desirable that the film 14 be roughened.

  Specifically, it is desirable that the arithmetic average roughness Ra of the outer peripheral surface is roughened in a range of 0.2 μm to 2.0 μm. When the outer peripheral surface of the core body 12 is roughened within the above range, residual solvent and water vapor generated from the coating film 14 are dried when the coating film 14 formed on the core body 12 is dried or fired. 12 is discharged through a slight gap between the coating film 14 and the coating film 14. For this reason, the occurrence of swelling in the coating film 14 is suppressed.

  As a method for roughening the outer peripheral surface of the coating film 14, there are methods such as blasting, cutting, sandpapering and the like. In particular, in order to make the inner surface of the coating film 14 into a spherical convex shape, it is preferable that the outer peripheral surface of the core body 12 is subjected to a blasting process using spherical particles. Blasting using spherical particles is a method in which particles made of glass, alumina, zirconia, or the like having a diameter of about 0.1 mm to 1 mm are sprayed onto the core with compressed air. When amorphous alumina particles (for example, general abrasive particles) are used as the particles, the shape of the outer peripheral surface of the core body 12 is also irregular, and in particular, an acute-angled protrusion or depression is easily formed, and the cylinder to be produced Since sharp protrusions and depressions are formed on the inner peripheral surface of the member, it is not preferable.

  A release layer is formed on the outer peripheral surface of the core body 12. This release layer is formed by uniformly applying a release agent over the entire outer peripheral surface of the core body 12. As a result, the entire area of the outer peripheral surface of the core body 12 is in a state having releasability. As this mold release agent, those obtained by modifying silicone oil or fluorine oil to have heat resistance are effective. Further, an aqueous release agent in which ultrafine particles of silicone resin are dispersed in water is also used. The release layer is formed by applying a release agent to the outer peripheral surface of the core body 12 and drying the solvent as it is or by baking.

(Configuration of support device 20)
As shown in FIGS. 2 and 3, the support device 20 rotates in contact with the outer peripheral surface of the core body 12 and applies a rotational force to the core body 12, and a drive unit 24 (FIG. 4). And a gear train 26 as a transmission member for transmitting the driving force from the rotor 22 to the rotating body 22, and a support body 28 that rotatably supports the rotating body 22 and the gear train 26. .

  The support body 28 includes a pair of side plates 29 and a bottom plate 27 provided integrally with the side plate 29 between the pair of side plates 29. The rotating body 22 is rotatably supported by the pair of side plates 29 between the pair of side plates 29, and the gear train 26 is rotatably supported by the pair of side plates 29 or the bottom plate 27.

  A pair of rotating bodies 22 is arranged at each of both axial ends of the core body 12. The core body 12 placed on the rotating body 22 is supported by the rotating body 22 from below.

  The gear train 26 meshes with a chain 25 in which a gear (sprocket) 26A on the most upstream side in the transmission direction circulates (rotates) by the driving force of the drive unit 24 as an example of the first rotating means.

  As a result, in the support device 20, the driving force of the driving unit 24 is transmitted to the rotating body 22 by the chain 25 and the gear train 26 that circulate (rotate) to rotate the rotating body 22, and the rotating body 22 rotates. The core body 12 is configured to rotate.

  The transport unit 16 is configured by a belt conveyor, supports the support device 20 at both axial ends of the core body 12, and the belt 16A circulates and moves the support device 20 to the cleaning unit 30, the coating unit 50, The drying part 72 and the baking part 80 are conveyed in this order. In the support device 20, even in the transport state by the transport unit 16, the driving force of the drive unit 24 is transmitted to the rotating body 22 by the chain 25 and the gear train 26 that circulates (rotates), and the rotating body 22 rotates. The core body 12 is rotated by the rotation of the rotating body 22.

(Configuration of the cleaning unit 30)
As shown in FIG. 4, the cleaning unit 30 includes a lifting device 40 that lifts and lowers the core body 12, a rotating device 42 that grips the core body 12 raised by the lifting device 40 and rotates the core body 12, and a rotating device. And a cleaning device 32 that cleans the outer peripheral surface of the core body 12 rotated by 42.

  The lifting device 40 includes a pair of lifting members 40 </ b> A that support the support device 20 from below at both axial ends of the core body 12 and lift the support device 20. The elevating device 40 is configured to elevate the core body 12 together with the support device 20 by, for example, extending and contracting a pair of elevating members 40A. The core body 12 is lifted by the elevating device 40, so that the connection state between the chain 25 as an example of the transmission member and the gear train 26 is canceled and the drive unit 24 is disconnected, and the drive force from the drive unit 24 is increased. Although it is in a free state where it is not given, it rotates by inertia even in a state where it is raised by the lifting device 40. Further, the raised core body 12 is lowered by the elevating device 40, whereby the chain 25 and the gear train 26 are connected, and a driving force from the driving unit 24 can be applied.

  As shown in FIG. 5, the rotating device 42 includes a detection unit 44 that detects the number of rotations of the core body 12 that is rotated by inertia by the lifting device 40, and a pair of grippers that hold the core body 12 that is rotated by inertia by the lifting device 40. A gripping member 46, a rotating unit 48 as an example of a second rotating unit that rotates the pair of gripping members 46, and a control unit 49 that controls the number of rotations of the pair of gripping members 46 based on the detection result of the detection unit 44. It is equipped with.

  The detection part 44 is comprised by the rotary encoder which detects the rotation speed of the core 12 which rotates with inertia, for example. The detection unit 44 is not limited to a rotary encoder.

  For example, the rotating unit 48 includes a drive motor such as a servo motor or a pulse motor for each of the pair of gripping members 46. A pair of gripping members 46 are rotated by this drive motor.

  The control unit 49 controls the rotating unit 48 so as to rotate each of the pair of gripping members 46 in the same direction at the same rotation speed. Furthermore, the control unit 49 controls the rotating unit 48 based on the detection result of the detecting unit 44 so that the pair of gripping members 46 rotate at the same rotational speed in the same direction as the core body 12.

  The rotating unit 48 is configured such that the driving force from a single driving unit is distributed to the pair of gripping members 46 by the gear train 26 and the pair of gripping members 46 rotate in the same direction at the same speed. Also good.

  The pair of gripping members 46 are made of a metal material such as aluminum or stainless steel (SUS), for example. Each of the pair of gripping members 46 has a tip portion formed in a conical shape. The distal end portion is inserted into the inner space of the core body 12 from both axial ends of the core body 12 and is configured to contact the inner periphery of the end portion of the core body 12. As a result, the core body 12 is sandwiched and gripped from both axial ends of the core body 12 by the pair of gripping members 46 rotated by the rotating portion 48. Further, the core body 12 is rotationally driven by the rotating portion 48 while being gripped by the pair of gripping members 46. For example, when stainless steel (SUS) is used as the core body 12, it is desirable to use stainless steel (SUS), which is the same material as the core body 12, for the grip member 46 serving as the counterpart.

  As shown in FIG. 4, the cleaning device 32 includes a waste 34 as an example of a wiping member for wiping the outer peripheral surface of the core body 12 rotated by the rotating unit 48, a supply unit 36 for supplying a cleaning liquid to the waste 34, and a pair And a moving mechanism 38 that moves the waste 34 and the supply unit 36 along the axial direction of the core body 12 held by the holding member 46.

  The waste 34 includes an unwinding roll 39 as an example of an unwinding member that unwinds the waste 34, a winding roll 37 as an example of a winding member that winds up the waste 34 unwound from the unwinding roll 39, and a winding It is wound around a pressing roll 35 as an example of a pressing member that presses the waste 34 unwound from the unwinding roll 39 between the take-up roll 37 and the unwinding roll 39 to the core body 12. The unwinding roll 39, the winding roll 37, and the pressing roll 35 are rotatably supported by the support 33. The waste 34 is shorter than the axial length of the core body 12, and is configured to wipe the outer peripheral surface of the core body 12 by contacting a part of the core body 12 in the axial direction.

  The supply unit 36 is configured to supply a cleaning liquid to the waste 34 by discharging a cleaning liquid (for example, an organic solvent such as ethanol) to the waste 34. Thereby, the outer peripheral surface of the core body 12 is wiped by the waste 34 impregnated with the cleaning liquid. The supply unit 36 may be configured to supply the cleaning liquid directly to the outer peripheral surface of the core body 12. As the supply unit 36, a coating method other than ejection may be used. Further, the cleaning liquid may be preliminarily impregnated in the waste 34.

  The moving mechanism 38 is configured to integrally move the support 33 and the supply unit 36 along the guide 31 formed in the axial direction of the core body 12 held by the pair of holding members 46. As a result, in the cleaning device 32, the waste 34 and the supply unit 36 are moved integrally along the axial direction of the core body 12 rotated by the rotating unit 48 by the moving mechanism 38, and the waste 34 impregnated with the cleaning liquid is the core. The outer peripheral surface of the body 12 is wiped off.

(Configuration of application unit 50)
As shown in FIGS. 6 and 7, the application unit 50 is rotated by the elevating device 40 that raises and lowers the core body 12, the rotating device 42 that rotates the core body 12 raised by the elevating device 40, and the rotating device 42. And a coating device 52 that applies a resin solution 54 to the outer peripheral surface of the core body 12.

  As in the case of the cleaning unit 30, the lifting device 40 includes a pair of lifting members 40 </ b> A that support the support device 20 from below at both axial ends of the core body 12 and lift the support device 20. The elevating device 40 is configured to elevate the core body 12 together with the support device 20 by, for example, extending and contracting a pair of elevating members 40A. The core body 12 is lifted by the elevating device 40, so that the connection state between the chain 25 as an example of the transmission member and the gear train 26 is canceled and the drive unit 24 is disconnected, and the drive force from the drive unit 24 is increased. Although it is in a free state where it is not given, it rotates by inertia even in a state where it is raised by the lifting device 40. Further, the raised core body 12 is lowered by the elevating device 40, whereby the chain 25 and the gear train 26 are connected, and a driving force from the driving unit 24 can be applied.

  As shown in FIG. 5, the rotating device 42 includes a detection unit 44 that detects the number of rotations of the core body 12 that is rotated by inertia by the lifting device 40, and a pair of grippers that hold the core body 12 that is rotated by inertia by the lifting device 40. A gripping member 46, a rotating unit 48 as an example of a second rotating unit that rotates the pair of gripping members 46, and a control unit 49 that controls the number of rotations of the pair of gripping members 46 based on the detection result of the detection unit 44. It is equipped with.

  The detection part 44 is comprised by the rotary encoder which detects the rotation speed of the core 12 which rotates with inertia, for example. The detection unit 44 is not limited to a rotary encoder.

  For example, the rotating unit 48 includes a drive motor such as a servo motor or a pulse motor for each of the pair of gripping members 46. A pair of gripping members 46 are rotated by this drive motor.

  The control unit 49 controls the rotating unit 48 so as to rotate each of the pair of gripping members 46 in the same direction at the same rotation speed. Furthermore, the control unit 49 controls the rotating unit 48 based on the detection result of the detecting unit 44 so that the pair of gripping members 46 rotate at the same rotational speed in the same direction as the core body 12.

  The rotating unit 48 is configured such that the driving force from a single driving unit is distributed to the pair of gripping members 46 by the gear train 26 and the pair of gripping members 46 rotate in the same direction at the same speed. Also good.

  The pair of gripping members 46 are made of a metal material such as aluminum or stainless steel (SUS), for example. Each of the pair of gripping members 46 has a tip portion formed in a conical shape. The distal end portion is inserted into the inner space of the core body 12 from both axial ends of the core body 12 and is configured to contact the inner periphery of the end portion of the core body 12. As a result, the core body 12 is sandwiched and gripped from both axial ends of the core body 12 by the pair of gripping members 46 rotated by the rotating portion 48. Further, the core body 12 is rotationally driven by the rotating portion 48 while being gripped by the pair of gripping members 46. For example, when stainless steel (SUS) is used as the core body 12, it is desirable to use stainless steel (SUS), which is the same material as the core body 12, for the grip member 46 serving as the counterpart.

  As shown in FIG. 6, the coating device 52 supplies the resin solution 54 to the outer peripheral surface of the core body 12, and smoothes the resin solution 54 supplied by the supply section 56 on the outer peripheral surface of the core body 12. The plate-like blade 58 and a moving mechanism 59 that moves the supply unit 56 and the blade 58 along the axial direction of the core body 12 held by the pair of holding members 46 are provided.

  The supply unit 56 is configured to discharge the resin solution 54 stored in the storage unit 56 </ b> A from the discharge unit 56 </ b> C by the pump 56 </ b> B and supply the resin solution 54 to the outer peripheral surface of the core body 12. As the supply unit 56, a coating method other than ejection may be used.

  The blade 58 is configured to come into contact with the outer peripheral surface of the core body 12, smooth the resin solution 54, and uniformize the film thickness of the coating film 14 formed by the resin solution 54. The blade 58 and the discharge unit 56 </ b> C are supported by the support body 57.

  The moving mechanism 59 applies a driving force to the support body 57 via a transmission member 51 such as a ball screw or a belt along a guide 55 formed in the axial direction of the core body 12 held by the pair of gripping members 46. It is configured to transmit and move. As a result, in the coating device 52, the coating film 14 made of the resin solution 54 is cored while the ejection unit 56 </ b> C and the blade 58 are moved integrally along the axial direction of the core body 12 rotated by the rotating unit 48 by the moving mechanism 59. The structure is formed on the outer peripheral surface of the body 12. The supply of the resin solution 54 to the core body 12 is performed in a state where the support device 20 (the rotating body 22) is separated from the core body 12 by lowering the support device 20 by the lifting device 40.

(Configuration of drying unit 72)
As shown in FIG. 8, the drying unit 72 includes a heating device 74 having therein an accommodation space 74 </ b> A that can accommodate the support device 20 in a state where the core body 12 is supported. In the heating device 74, the support body 20 passes through the accommodation space 74 </ b> A while the core 12 rotates so that the liquid does not leak from the coating film 14, and the coating film 14 is dried by evaporating the moisture of the resin solution 54. It is supposed to be. As a result, the coating film 14 is cured.

(Configuration of firing unit 80)
As shown in FIG. 9, the firing unit 80 includes a pedestal 82 on which the core body 12 lowered from the support device 20 is placed vertically. In the baking part 80, the core body 12 mounted on the base 82 is heated, and the coating film 14 is baked. As a result, the coating film 14 is cured.

  The core body 12 on which the coating film 14 is baked is cooled to room temperature, and then the air injection unit 84 as an example of a mold releasing unit performs axial directions of the baked coating film 14 and the outer peripheral surface of the core body 12. The air is injected into the gap with the end portion, whereby the fired coating film 14 is removed from the core body 12.

(Manufacturing method of cylindrical member)
Next, the manufacturing method of the cylindrical member using the cylindrical member manufacturing apparatus which concerns on this embodiment is demonstrated.

  In the present manufacturing method, the cleaning unit 30 is transported by the transport unit 16 while being rotated by the driving force of the drive unit 24 while the core body 12 is placed on the support device 20.

  Next, in the cleaning unit 30, the core body 12 is raised together with the support device 20 by the lifting device 40. Thereby, the core 12 is disconnected from the drive unit 24 and rotates with inertia (core rotation process).

  Next, the detection unit 44 detects the number of rotations of the core body 12 that rotates due to inertia (detection step). Based on the detection result, the rotation unit 48 is controlled by the control unit 49 (control process), and the pair of gripping members 46 are rotated by the rotation unit 48 in the same direction and at the same rotation speed as the core body 12 (rotation of the gripping member). Process).

  Next, a pair of gripping members 46 rotating in the same direction and at the same rotation speed as the core body 12 grip the inner periphery of the end of the core body 12 (gripping step). Next, the rotational speed of the pair of gripping members 46 is gradually increased, and the rotational speed of the core body 12 is increased. Thus, the core body gripping method for gripping the core body 12 is performed.

  The waste 34 impregnated with the cleaning liquid is moved by the moving mechanism 38 along the axial direction of the core 12 rotated by the rotating unit 48, and is gripped by the pair of gripping members 46 and rotated on the outer peripheral surface of the core 12. (Washing process).

  Next, the support device 20 is lowered by the elevating device 40 and placed on the transport unit 16. Next, while the core body 12 is placed on the support device 20, the coating unit 50 is transported by the transport unit 16 while being rotated by the driving force of the driving unit 24.

  Next, in the application unit 50, the core body 12 is raised together with the support device 20 by the lifting device 40, as in the cleaning unit 30. Thereby, the core 12 is disconnected from the drive unit 24 and rotates with inertia (core rotation process).

  Next, the detection unit 44 detects the number of rotations of the core body 12 that rotates due to inertia (detection step). Based on the detection result, the rotation unit 48 is controlled by the control unit 49 (control process), and the pair of gripping members 46 are rotated by the rotation unit 48 in the same direction and at the same rotation speed as the core body 12 (rotation of the gripping member). Process).

  Next, a pair of gripping members 46 rotating in the same direction and at the same rotation speed as the core body 12 grip the inner periphery of the end of the core body 12 (gripping step). Next, the rotational speed of the pair of gripping members 46 is gradually increased, and the rotational speed of the core body 12 is increased. Thus, the core body gripping method for gripping the core body 12 is performed.

  Then, the resin solution 54 is applied to the outer peripheral surface of the core body 12 while the discharge section 56C and the blade 58 are integrally moved along the axial direction of the core body 12 rotated by the rotating section 48 by the moving mechanism 59. A liquid coating film 14 is formed (coating process).

  Next, the support device 20 is lowered by the elevating device 40 and placed on the transport unit 16. Next, while the core body 12 is placed on the support device 20, the heating device 74 of the drying unit 72 is transported by the transport unit 16 while being rotated by the driving force of the driving unit 24. The support device 20 passes through the accommodation space 74A of the heating device 74, and the coating film 14 is dried (drying process).

  Next, in the baking part 80, the core body 12 which was taken down from the support apparatus 20 and mounted on the base 82 is heated, and the coating film 14 is baked (baking process).

  As described above, in the present embodiment, a heating process for heating and curing the liquid coating film 14 is configured by the drying process and the baking process.

  Next, after the core body 12 on which the coating film 14 is baked is cooled to room temperature, the air injection section 84 causes the gap between the baked coating film 14 and the axial end portion of the outer peripheral surface of the core body 12. By injecting air, the fired coating film 14 is removed from the core body 12 (demolding step), and a cylindrical member is manufactured.

  As described above, in the manufacturing method of the present embodiment, the pair of gripping members 46 that rotate in the same direction and the same number of rotations as the core body 12 grip the core body 12, so the core body 12 is held by the non-rotating gripping member 46. Compared to the case of gripping, generation of wear powder caused by rubbing the core body 12 and the gripping member 46 is suppressed. Thereby, adhesion of the wear powder to the cylindrical member to be manufactured is suppressed.

  Further, in the present embodiment, the rotational speed of the core body 12 is increased after the core body 12 rotating to some extent is gripped by the pair of gripping members 46, and therefore the rotational speed of the core body 12 is increased from the non-rotating state. As compared with the above, the generation of wear powder caused by rubbing the core 12 and the gripping member 46 is suppressed. Thereby, adhesion of the wear powder to the cylindrical member to be manufactured is suppressed.

  Further, in the manufacturing method of the present embodiment, since the pair of gripping members 46 grip the inner periphery of the end portion of the core body 12, even if wear powder is generated by rubbing the core body 12 and the gripping member 46, Since the peripheral speed is low, there is little wear, and the wear powder tends to stay on the inner peripheral side of the core body 12. Thereby, compared with the case where the edge part inner periphery of a metal mold | die is not gripped, adhesion of the abrasion powder to the cylindrical member manufactured is suppressed.

  In the present embodiment, the pair of gripping members 46 are configured to grip the core 12 that rotates by inertia, but the pair of gripping members 46 are given a driving force from the drive unit 24. The structure which hold | grips the core 12 of a state may be sufficient.

  In the present embodiment, the core body 12 is moved up and down to disconnect the core body 12 and the drive unit 24. However, the present invention is not limited to this, and the core body 12 and the drive unit 24 are separated from each other. The drive unit 24 may be cut off.

  In the present embodiment, the pair of gripping members 46 are configured to rotate in the same direction and the same number of rotations as the core 12 that rotates by inertia, but at least the number of rotations of the core 12 that rotates by inertia. It is only necessary that the pair of gripping members 46 rotate so that the difference between the pair of gripping members 46 is smaller than the difference from the case where the rotation speed is zero. That is, in a specific range, a difference in rotational speed may occur between the core 12 that rotates by inertia and the pair of gripping members 46.

  Hereinafter, the present invention will be specifically described with reference to examples and comparative examples. However, it is not limited to these.

Example 1
A stainless steel tube having an inner diameter of 253 mm, a length of 980 mm, a thickness of 6.9 mm, and a weight of 14 kg was prepared as the core body 12, and the outer peripheral surface was blasted to Ra 0.45 μm. After degreasing the surface of the core body 12, a mixed liquid of silicon-based mold release agent “Sepacoat” manufactured by Shin-Etsu Chemical Co., Ltd. and heptane was applied and baked at 420 ° C. for 2 hours. Further, after the core 12 was sufficiently cooled, the above-mentioned mixed solution of the release agent and heptane was applied again, and this time, baking was performed at 330 ° C. for 1 hour. As a result, a release layer was formed on the outer peripheral surface of the core body 12 to adjust the core body 12 having an outer peripheral surface having releasability.

  Using the adjusted core body 12, the cylindrical member manufacturing apparatus 10 shown in the above embodiment performed the manufacturing method shown in the above embodiment to manufacture a cylindrical member.

  Specifically, with the core body 12 placed on the support device 20, the coating unit 50 is transported by the transport unit 16 while being rotated at 10 rpm by the driving force of the driving unit 24. Next, in the application unit 50, the core body 12 is raised together with the support device 20 by the lifting device 40. Thereby, the core 12 is disconnected from the drive unit 24 and rotates with inertia (core rotation process). Next, the detection unit 44 detects the number of rotations of the core body 12 that rotates due to inertia (detection step). The rotation speed detected at this time was 9 rpm. Based on the detection result, the rotation unit 48 is controlled by the control unit 49 (control process), and the pair of gripping members 46 are rotated by the rotation unit 48 in the same direction and the same rotation speed (9 rpm) as the core body 12 ( Gripping member rotation step). Next, the pair of gripping members 46 that rotate in the same direction and at the same rotation speed as the core body 12 grip the inner periphery of the end of the core body 12 with a pressure of 0.3 MPa (gripping process). Next, the rotational speed of the pair of gripping members 46 was gradually increased, and the rotational speed of the core body 12 was increased from 9 rpm to 99.7 rpm over 2 seconds.

  In addition, in the application part 50, 20 parts by weight of carbon is dispersed in 100 parts by weight of a PI precursor solution (trade name: Uimide, manufactured by Unitika) having a viscosity of 50 Pa · s at 25 ° as the resin solution 54. Was used. The film forming conditions in the coating unit 50 were such that the resin solution 54 was supplied to the outer peripheral surface of the core body 12 from a nozzle having a diameter (inner diameter) of 2 mm and a length of 10 mm using a MONO pump as the pump 56B. The rotational speed of the core body 12 was 99.7 rpm, and the moving speed of the discharge unit 56C and the blade 58 (moving speed of the core body 12 in the axial direction) was 229 mm / min.

  Further, in the drying unit 72, the core body 12 was rotated at 10 rpm, and the support device 20 was placed in a heating device 74 at 130 ° C. and dried for 23 minutes.

  Moreover, in the baking part 80, with the core 12 vertically installed on the pedestal 82, the polyimide is heated at 125 ° C., 185 ° C., 230 ° C., 260 ° C. and heated for 27.5 minutes respectively. The coating film 14 made of resin was baked. And after cooling to room temperature, the baked coating film 14 was removed from the core body 12 to produce an endless belt as a cylindrical member.

  The obtained endless belt had an average film thickness of 80 μm, a good quality free from defects such as swelling and dents on the surface, and a shape having a desired roughness on the back surface. When the endless belt was used as a transfer belt in a color electrophotographic apparatus, even if the rotation was continued, there was no stain on the back surface of the transfer belt, no toner accumulation, and a print with good image quality without image defects was obtained. The defect due to metal powder was zero.

(Example 2)
In the manufacturing method implemented by the cylindrical member manufacturing apparatus 10 of Example 1, the rotational speed of the core body 12 detected by the detection unit 44 was 5 rpm. On the other hand, based on the detection result, the rotation unit 48 is controlled by the control unit 49 (control process), and the pair of gripping members 46 are rotated by the rotation unit 48 in the same direction as the core body 12 and at a rotation speed of 9 rpm. (Holding member rotating step). Next, the pair of gripping members 46 that rotate in the same direction and at the same rotation speed as the core body 12 grip the inner periphery of the end of the core body 12 with a pressure of 0.3 MPa (gripping process). Next, the rotational speed of the pair of gripping members 46 was gradually increased, and the rotational speed of the core body 12 was increased from 9 rpm to 99.7 rpm over 2 seconds.

  The defect occurrence rate of the obtained endless belt was about 1%, which was inferior to that of Example 1, but was negligibly small.

(Comparative Example 1)
In the manufacturing method implemented by the cylindrical member manufacturing apparatus 10 of Example 1, the core body 12 rotating at 9 rpm was gripped by a pair of non-rotating gripping members 46. Next, the rotational speed of the pair of gripping members 46 was gradually increased, and the rotational speed of the core body 12 was increased by 99.7 rpm over 2 seconds.

  As a result, the obtained endless belt had defects in the metal powder, and protrusions were formed on the surface.

When the endless belt was used as a transfer belt in a color electrophotographic apparatus, a defective image quality was obtained at the same location as the metal powder. About 6% of the defective endless belts having such defects were generated. It was found that a lot of wear powder was generated when the core was rotated from the non-rotating state.

(Comparative Example 2)
In the manufacturing method implemented by the cylindrical member manufacturing apparatus 10 of Example 1, the core body 12 was brought into a non-rotating state, and the non-rotating core body 12 was gripped by a pair of gripping members 46 in a non-rotating state. Next, the rotational speed of the pair of gripping members 46 was gradually increased, and the rotational speed of the core body 12 was increased by 99.7 rpm over 2 seconds.

  As a result, the defect occurrence rate of the obtained endless belt was about 3%, which was less than that of Comparative Example 1, but it was found that even when the core body 12 was rotated from the non-rotating state, wear powder was generated. .

  The present invention is not limited to the above-described embodiment, and various modifications, changes, and improvements can be made.

10 cylindrical member manufacturing apparatus 12 core (example of mold)
24 Drive unit (an example of first rotating means)
46 Grasping member 48 Rotating part (an example of second rotating means)
50 Application part (an example of application means)
70 Heating part (an example of heating means)
84 Air injection part (an example of demolding means)

Claims (5)

A mold rotating step of rotating the mold by the first rotating means;
The gripping member is moved by the second rotating means so that the difference from the rotational speed of the mold rotated by the mold rotating process is smaller than the difference from the case where the rotational speed of the mold is zero. A gripping member rotation process for rotating in the same direction as the mold;
A gripping step of gripping a mold rotated by the mold rotating step by the gripping member rotating by the gripping member rotating step;
A mold holding method. The mold rotating step disconnects the first rotating means and the mold to rotate the mold with inertia,
The gripping member rotation step includes
A detection step of detecting the number of rotations of the mold rotating by inertia by the mold rotation step;
A control step of controlling the number of rotations of the gripping member according to a detection result in the detection step;
The mold holding method according to claim 1 provided with. The mold is formed into a columnar shape or a cylindrical shape, and the mold held by the mold holding method according to claim 1 or 2 is rotated on the outer peripheral surface of the mold while being rotated by the second rotating means. An application process for applying a liquid;
A heating step of heating and curing the liquid applied in the application step;
A demolding step of demolding the liquid cured in the heating step from the mold;
The manufacturing method of a cylindrical member provided with.   The manufacturing method of the cylindrical member according to claim 3, wherein in the gripping step, a gripping member grips an inner periphery of an end of a mold that is a cylinder and has at least an axial end that is a circular pipe. First rotating means for rotating a columnar or cylindrical mold;
While rotating in the same direction as the mold, the difference between the rotational speed of the mold rotated by the first rotating means is smaller than the difference from the case where the rotational speed of the mold is zero. A gripping member for gripping the mold;
Application means for applying a liquid to the outer peripheral surface of the mold rotated by the gripping member;
Heating means for heating and curing the liquid applied by the application means;
A demolding means for demolding the liquid cured by the heating means from the mold;
A cylindrical member manufacturing apparatus comprising:

Images